<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
<!--true登录 不显示   false未登录 显示-->
  <div v-if="!isLogin">
    <a href="javascript:void(0)">注册</a>
    <!--如果超链接点击时  不离开此页面需要添加javascript:void(0)
    废掉跳转功能-->
    <a href="javascript:void(0)" @click="isLogin=true">登录</a>
  </div>
  <div v-else>
    <input type="text" v-model="newName">
    <input type="button" value="添加" @click="arr.push(newName)">
    <a href="javascript:void(0)" @click="isLogin=false">登出</a>
  </div>
  <ul>
    <li v-for="name in arr">{{name}}</li>
  </ul>
</div>
<script src="../js/vue.js"></script>
<script>
  let v = new Vue({
    el:"body>div",
    data:{
      newName:"",
      arr:["刘备","关羽"],
      isLogin:false
    }
   /* methods:{
      f(){
        v.arr.push({name.name : v.name});
        v.name=""
      }
    }*/
  })
</script>
</body>
</html>